<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Red Heart</title>
	<style>
		html, body {
			height: 100%;
		}

		body {
			margin: 0;
			padding: 0;
			background: #ffa5a5;
			background: linear-gradient(to bottom, #ffa5a5 0%,#ffd3d3 100%);
		}

		.chest {
			width: 500px;
			height: 500px;
			margin: 0 auto;
			position: relative;
		}

		.heart {
			position: absolute;
			z-index: 2;
			background: linear-gradient(-90deg, #F50A45 0%, #d5093c 40%);
			animation: beat 0.7s ease 0s infinite ;
		}

		.heart.center {
			background: linear-gradient(-45deg, #B80734 0%, #d5093c 40%);
		}

		.heart.top {
			z-index: 3;
		}

		.side {
			top: 100px;
			width: 220px;
			height: 220px;
			border-radius: 220px;
		}

		.center {
			width: 210px;
			height: 210px;
			bottom: 100px;
			left: 145px;
			transform: rotate(45deg);
		}

		.left {
			left: 62px;
		}

		.right {
			right: 62px;
		}

	.love{
			box-sizing: border-box;
			width: 100%;
			text-align: center;
			font-size: 50px;
			text-shadow: 1px 1px 10px;
		}
		@keyframes beat {
			0% {
				transform: scale(1) rotate(225deg);
				box-shadow:0 0 40px #d5093c;
			}

			50% {
				transform: scale(1.1) rotate(225deg);
				box-shadow:0 0 70px #d5093c;
			}

			100% {
				transform: scale(1) rotate(225deg);
				box-shadow:0 0 40px #d5093c;
			}
		}
	#btn{
		outline: none;
		font-size: 20px;
		text-align: center;
		background-color: transparent;
		border: none;
		display: block;
		cursor: pointer;
		margin:20px auto ;
		color: #f40;
		text-shadow: 2px 2px 10px;
	}

	</style>
</head>
<body>
	<div class="chest">
		<div class="heart left side top"></div>
		<div class="heart center"></div>
		<div class="heart right side"></div>
	</div>
	<div class="love">love</div>
	<button type="button" id="btn">爱我你就点吧</button>
</body>
<script>
	var chest=document.querySelector('.chest');
	var btn=document.querySelector('#btn');
	btn.onclick=function(){
		console.log(1);
		document.body.style.background="url('http://hdn.xnimg.cn/photos/hdn121/20111205/1545/h_large_dt1X_6fa300029d942f76.jpg') no-repeat center/cover";
		btn.style.display='none';
		chest.style.opacity=.5;
		chest.style.transform='scale(.5)';
	}
</script>
</html>